The Inverse Problem of Electrical Conductivity in the Mantle

The general method of Backus and Gilbert is applied to the inverse problem of electrical conductivity in the mantle. The data of Banks are reworked to obtain a new model and its uncertainties. It is concluded that the levelling-off in conductivity previously obtained is only barely resolvable with current observations. A great improvement in the accuracy of the model could be expected if more precise data were available in the same frequency range.